CN108487949B - Variable damping squeeze oil film damper for aircraft engine - Google Patents
Variable damping squeeze oil film damper for aircraft engine Download PDFInfo
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- CN108487949B CN108487949B CN201810689142.1A CN201810689142A CN108487949B CN 108487949 B CN108487949 B CN 108487949B CN 201810689142 A CN201810689142 A CN 201810689142A CN 108487949 B CN108487949 B CN 108487949B
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- oil
- hydraulic
- variable damping
- squeeze
- oil film
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/04—Antivibration arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
- F16F15/16—Suppression of vibrations in rotating systems by making use of members moving with the system using a fluid or pasty material
- F16F15/161—Suppression of vibrations in rotating systems by making use of members moving with the system using a fluid or pasty material characterised by the fluid damping devices, e.g. passages, orifices
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Support Of The Bearing (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention disclosesThe variable damping squeeze oil film damper of the aero-engine is provided, and comprises an elastic support, a variable damping base, a hydraulic oil cavity, a hydraulic oil flow channel, a hydraulic adjusting screw and a squeeze oil film; the inner wall of the variable damping base is provided with a hydraulic oil cavity, the shape of the hydraulic oil cavity after being divided along the axial direction is a flat gap with large spaces at two sides and small middle space, and a wall thickness structure close to one side of the inner wall surface presents a thin-wall shape with thin sides and thick middle. The variation range of the clearance is 0.2C-1C (C is the thickness of an extruded oil film), and the variation range of the damping of the equipment can reach 1Cd～5Cd(CdTo design minimum damping values); the hydraulic oil cavity is communicated with a threaded hole on the axial end face of the equipment through a flow channel, and the threaded hole is provided with a hydraulic adjusting screw; the hydraulic adjusting screw is located above the axis position, the hydraulic oil cavities are arranged along the circumference, oil inlet holes for the extruded oil films are formed in the interrupted positions of the hydraulic oil cavities, and the oil is supplied to the extruded oil films in real time through the oil inlet holes for the extruded oil films.
Description
Technical Field
The invention belongs to the field of aeroengine rotors, and particularly relates to a variable damping squeeze film damper for an aeroengine.
Background
The vibration is one of the main reasons for the structural stability reduction, the failure and even the component damage of the aircraft engine. With the improvement of the design index of the engine, the requirements on high rotating speed and low rotor quality are higher and higher, the vibration problem is more and more prominent, and the vibration reduction also becomes the important content of the structural strength research of the aero-engine. Squeeze film dampers are one of the most commonly used vibration damping devices in aircraft engines. Squeeze film dampers have been developed to date, and are almost essential vibration dampers in modern advanced aircraft engines, and one or more squeeze film dampers are often arranged on one type of engine so that a rotor system has good vibration characteristics when the rotor system is over-critical.
When the rotating speed of the rotor passes through a critical rotating speed area, the vibration amplitude rises sharply, in order to reduce the vibration amplitude when the rotating speed is over critical, the rigidity and the damping of equipment need to be carefully designed, the squeeze film damper connects an external elastic device with a bearing in parallel, and the rigidity of the external elastic supporting device is far lower than that of the bearing, so that the integral rigidity of the system can be effectively reduced. Meanwhile, the squeeze oil film can generate a larger damping effect, so that the vibration can be effectively suppressed when the system vibrates in a supercritical manner, and the vibration amplitude of the equipment is remarkably reduced.
However, the damping value of the existing squeeze film damper is fixed, and in the actual design process, because the clearance of the squeeze film is very small, the machining and assembling errors of parts can cause the actual oil film clearance to not meet the design requirement. Meanwhile, in the experimental and design stages of the rotor equipment, in order to find the optimal damping design value, the damping size of the damper needs to be continuously debugged, and the equipment with fixed damping cannot meet the requirement. Therefore, the invention designs a device capable of changing damping, realizes the adjustment of the damping size by adjusting the clearance of the squeeze film damper, and plays a better role in vibration reduction.
Disclosure of Invention
The invention aims to provide a variable damping squeeze film damper of an aircraft engine, which can realize the adjustable damping of the squeeze film damper by adjusting the damping clearance of the squeeze film damper, reduce the vibration amplitude of a rotor system during passing critical and can be applied to the experimental test of rotor equipment.
The invention is realized by adopting the following technical scheme:
a variable damping squeeze oil film damper of an aircraft engine is used for being sleeved on a rotor and comprises an elastic support, a variable damping base, a hydraulic oil cavity, a hydraulic oil flow channel, a hydraulic adjusting screw and a squeeze oil film; wherein the content of the first and second substances,
the elastic support and the equipment base are sleeved on the rotor from inside to outside, the end faces of the elastic support and the equipment base are connected together through the elastic support mounting base, and the elastic support mounting base is not in contact with the rotor; the inner wall of the elastic support is matched with an outer ring of a rolling bearing sleeved on the rotor, the rolling bearing is axially positioned through a step on the inner wall, and the end face of the rolling bearing is positioned through a sleeve sleeved on the rotor and an axial positioning nut;
the variable damping base is sleeved between the elastic support and the equipment base, two grooves provided with O-shaped sealing rings 17 are circumferentially formed in the outer wall surface of the elastic support, an extrusion oil film is arranged in the area between the two grooves, an oil film oil inlet groove is circumferentially formed in the outer wall surface of the elastic support between the two grooves, and an extrusion oil film oil inlet hole communicated with the oil film oil inlet groove is formed in the end surface of the variable damping base; the variable damping base is axially positioned by a step on the equipment base, a hollow area is arranged on the inner wall of the variable damping base, the hollow area is a hydraulic oil cavity, the hydraulic oil cavity is communicated with a threaded hole formed in the end face of the variable damping base through a hydraulic oil flow passage formed in the variable damping base, and a hydraulic adjusting screw is in threaded connection with the threaded hole.
The invention is further improved in that the elastic support and the elastic support mounting base are connected together by a connecting screw.
The invention is further improved in that the shape of the hydraulic oil cavity after being split along the axial direction is a flat gap with large spaces at two sides and small middle space, and the wall thickness structure close to one side of the inner wall surface is in a thin-wall shape with thin sides and thick middle.
The invention is further improved in that the wall thickness of the hydraulic oil chamber satisfies the following conditions: after the hydraulic oil pressure is increased, the deformation of the inner wall surface is concentrated in the stress concentration areas at two sides, so that the gap at the middle position is approximately uniformly changed, the gap change range is 0.2C-1C, according to the short bearing approximate theory under the condition of a half oil film, the damping value is inversely proportional to the 3 rd power of the gap, and the damping change range of the equipment can reach 1Cd～5CdWherein C is the thickness of the squeeze film CdTo design a minimum damping value.
The invention is further improved in that the threaded hole, the hydraulic oil flow passage and the hydraulic oil cavity are filled with hydraulic oil.
The invention is further improved in that the hydraulic adjusting screw is positioned right above the axis position, the hydraulic oil cavities are arranged along the circumference, the interrupted position of the hydraulic oil cavity is that an oil inlet hole of the extrusion oil film passes through, the oil inlet hole of the extrusion oil film is used for supplying oil to the extrusion oil film in real time, and the hydraulic adjusting screw and the oil inlet hole of the extrusion oil film are distributed along the circumference at a preset angle on the end surface.
The invention has the further improvement that the 5 per mill diameter clearance is taken as the initial design parameter of the clearance of the squeeze film, hydraulic adjustment is adopted, and the actual adjustment range can reach 1 per mill to 5 per mill so as to meet the damping requirements under various working conditions.
The invention has the following beneficial technical effects:
the invention can quickly realize the oil film clearance adjustment of the squeeze oil film damper by only the hydraulic adjusting screw positioned on the end surface of the equipment under the condition of not disassembling the main parts (such as a rotor, a bearing and the like) of the equipment, thereby obtaining the required damping value. Under the condition of not destroying the equipment assembly relation, the squeeze film damper can adapt to the changed working condition requirement, is safer, and saves the manpower and material resource loss of equipment installation and debugging.
Drawings
FIG. 1 is a general structural diagram of a variable damping squeeze film damper for an aircraft engine according to the present invention.
Fig. 2 is a schematic view of the rotary section along a-a in fig. 1.
Fig. 3 is a partial structural diagram.
In the figure: the device comprises a rotor 1, an equipment base 2, an elastic support mounting base 3, an elastic support 4, a mounting screw 5, a variable damping base 6, a hydraulic adjusting screw 7, an axial positioning nut 8, a sleeve 9, a rolling bearing 10, an extrusion oil film oil inlet hole 11, a threaded hole 12, a hydraulic oil cavity 13, an oil film oil inlet groove 14, an extrusion oil film 15, a hydraulic oil flow passage 16 and an O-shaped sealing ring 17.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
as shown in fig. 1 to 3, the variable damping squeeze film damper for the aircraft engine provided by the invention comprises an elastic support 4, a variable damping base 6, a hydraulic oil cavity 13, a hydraulic oil flow channel 16, a hydraulic adjusting screw 7 and a squeeze film 15.
As shown in fig. 2 and 3, the elastic support 4 is connected with the elastic support mounting base 3 through a mounting screw 5, and the elastic support mounting base 3 is assembled with the equipment base 2 without contacting with the rotor 1; the inner wall of the elastic support 4 is assembled with the outer ring of a rolling bearing 10 sleeved on the rotor 1, and the rolling bearing 10 is axially positioned through a step on the inner wall. Two grooves provided with O-shaped sealing rings 17 are formed in the circumferential direction of the outer wall surface of the elastic support 4, and an extrusion oil film 15 of the damper is arranged in the middle of each groove. The invention takes the squirrel cage support as the elastic support, and can work with various types of elastic supports including the squirrel cage support in practice but not limited to the squirrel cage support.
Referring to fig. 3, the variable damping base 6 is assembled with the apparatus base 2 with the axial direction thereof being positioned by a step on the apparatus base 2, and a gap between the inner wall of the variable damping base 6 and the elastic support 4 is defined as a squeeze oil film gap (denoted by c) of the damper. O-shaped sealing rings 17 are arranged on two sides of the axial position of the gap area for sealing, and lubricating oil in the gap of the damper is prevented from leaking. The inner wall of the variable damping base 2 is provided with a hollow area which is a hydraulic oil chamber 13, the shape of the hydraulic oil chamber 13 after being divided along the axial direction is a thin-wall shape with two sides being thin and the middle being thick, the space at the two sides is large, the space at the middle is small and is a flat gap, and the wall thickness structure close to one side of the inner wall surface is thin at the two sides and the middle is thick. The intermediate wall thickness is designed according to specific structural dimensions. The wall thickness needs to satisfy: when the hydraulic oil pressure is increased, the deformation of the inner wall surface is concentrated in the stress concentration areas at two sides, the gap at the middle position is approximately uniformly changed, the gap change range is 0.2C-1C (C is the thickness of an extrusion oil film), the damping value is inversely proportional to the 3 rd power of the gap according to the calculation formula (1), and the damping change range of the equipment can reach 1Cd～5Cd(CdTo design a minimum damping value).
In the formula: cdIs the damping value of the device, unit: ns/m; π is the circumference ratio, μ is the lubricant viscosity, unit: cst; r is the damper gap area radius, unit: m; l is the gap axial length, unit: m; eccentricity, c damping oil filmGap, unit: m;
according to design experience, the most common extrusion oil film gap is 2-3 per thousand, the invention takes a gap with a diameter of 5 per thousand as an initial design parameter of the extrusion oil film gap, adopts hydraulic adjustment, and the actual adjustment range can reach 1-5 per thousand, thereby meeting the damping requirements under various working conditions.
The hydraulic oil cavity 13 is communicated with a threaded hole 12 positioned on the axial end face of the equipment through a hydraulic oil flow passage 16, the threaded hole 12 is assembled with a hydraulic adjusting screw 7, and the interior of the threaded hole 12, the interior of the hydraulic oil flow passage 16 and the interior of the hydraulic oil cavity 13 are filled with hydraulic oil.
As shown in fig. 1 and 2, the mounting position of the hydraulic adjusting screw 7 is perpendicular to the end surface of the main shaft, and according to fig. 1, the hydraulic adjusting screw 7 is located right above the axial position, the hydraulic oil chamber 13 is arranged along the circumference, and the hydraulic oil chamber 13 is interrupted (the circumference of the actual design position is arbitrary, and the present invention is illustrated as the right-side θ angle area). Referring to fig. 2, an oil film extrusion inlet hole 11 is formed in the position, the hydraulic adjusting screw 7 and the oil film extrusion inlet hole 11 are distributed on the end surface along the circumference at a certain angle (90 degrees is taken as an example in the invention), and oil is supplied to an oil film extrusion 15 in real time through the oil film extrusion inlet hole 11; in the region of the extrusion oil film 15, an annular oil film oil inlet groove 14 is formed in the outer wall surface of the elastic support 4, so that lubricating oil can quickly fill the whole oil film region through the extrusion oil film oil inlet hole 11.
The working process of the invention is as follows:
when the installation of the equipment is completed, the hydraulic oil pressure is changed by changing the screwing length of the hydraulic adjusting screw 7 and utilizing the incompressible characteristic of the liquid. When the damping needs to be increased, the hydraulic adjusting screw 7 is screwed down, so that the pressure in the hydraulic oil cavity 13 is increased, the positions of two sides, with the lowest strength, of the inner wall of one side, close to the squeeze oil film 15, of the variable damping base 6 are deformed, the inner wall surface of the variable damping base 6 is integrally deformed and protruded, the gap of the squeeze oil film is reduced, and the damping value of the damper is increased. When the damping of the device needs to be reduced, the hydraulic adjusting screw 7 is unscrewed, so that the internal pressure of the hydraulic oil cavity 13 is reduced, the overall deformation of the inner wall surface of the variable damping base 6 is reduced, the squeeze film gap is increased, and the damping value of the damper is reduced.
Claims (6)
1. The variable damping squeeze oil film damper of the aircraft engine is characterized in that the variable damping squeeze oil film damper is sleeved on a rotor (1) and comprises an elastic support (4), a variable damping base (6), a hydraulic oil cavity (13), a hydraulic oil flow channel (16), a hydraulic adjusting screw (7) and a squeeze oil film (15); wherein the content of the first and second substances,
the elastic support (4) and the equipment base (2) are sleeved on the rotor (1) from inside to outside, the end faces of the elastic support (4) and the equipment base (2) are connected together through the elastic support mounting base (3), and the elastic support mounting base (3) is not in contact with the rotor (1); the inner wall of the elastic support (4) is matched with the outer ring of a rolling bearing (10) sleeved on the rotor (1), the rolling bearing (10) is axially positioned through a step positioned on the inner wall, and the end face of the rolling bearing (10) is positioned through a sleeve (9) sleeved on the rotor (1) and an axial positioning nut (8);
the variable damping base (6) is sleeved between the elastic support (4) and the equipment base (2), two grooves provided with O-shaped sealing rings (17) are formed in the outer wall surface of the elastic support (4) in the circumferential direction, an extrusion oil film (15) is arranged in the area between the two grooves, an oil film oil inlet groove (14) is formed in the outer wall surface of the elastic support (4) between the two grooves in the circumferential direction, and an extrusion oil film oil inlet hole (11) communicated with the oil film oil inlet groove (14) is formed in the end surface of the variable damping base (6); the variable damping base (6) is axially positioned by a step on the equipment base (2), a hollow area is arranged on the inner wall of the variable damping base (2), the hollow area is a hydraulic oil cavity (13), the hydraulic oil cavity (13) is communicated with a threaded hole (12) formed in the end face of the variable damping base (2) through a hydraulic oil flow passage (16) formed in the variable damping base (2), and a hydraulic adjusting screw (7) is in threaded connection with the threaded hole (12).
2. The aero-engine variable damping squeeze oil film damper as claimed in claim 1, wherein the elastic support (4) and the elastic support mounting base (3) are connected together by a connecting screw (5).
3. The variable damping squeeze film damper for the aircraft engine according to claim 1, wherein the hydraulic oil chamber (13) is divided in the axial direction to have a shape of a flat slit with a large space at both sides and a small space in the middle, and the wall thickness structure near one side of the inner wall surface has a thin wall shape with a thin side and a thick middle.
4. The aero-engine variable damping squeeze oil film damper as claimed in claim 1, wherein the wall thickness of the hydraulic oil chamber (13) is such that: after the hydraulic oil pressure is increased, the deformation of the inner wall surface is concentrated in the stress concentration areas at two sides, so that the gap at the middle position is approximately uniformly changed, the gap change range is 0.2C-1C, according to the short bearing approximate theory under the condition of a half oil film, the damping value is inversely proportional to the 3 rd power of the gap, and the damping change range of the equipment can reach 1Cd～5CdWherein C is the thickness of the squeeze film CdTo design a minimum damping value.
5. The aero-engine variable damping squeeze oil film damper as claimed in claim 1, wherein hydraulic oil is filled in the threaded hole (12), the hydraulic oil flow passage (16) and the hydraulic oil chamber (13).
6. The aero-engine variable damping squeeze oil film damper as claimed in claim 1, wherein the hydraulic adjusting screw (7) is located right above an axial position, the hydraulic oil chamber (13) is circumferentially arranged, the hydraulic oil chamber (13) is interrupted at a position where a squeeze oil film oil inlet hole (11) passes through, the squeeze oil film oil inlet hole (11) is used for supplying oil to the squeeze oil film (15) in real time, and the hydraulic adjusting screw (7) and the squeeze oil film oil inlet hole (11) are circumferentially distributed at a preset angle on the end surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810689142.1A CN108487949B (en) | 2018-06-28 | 2018-06-28 | Variable damping squeeze oil film damper for aircraft engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810689142.1A CN108487949B (en) | 2018-06-28 | 2018-06-28 | Variable damping squeeze oil film damper for aircraft engine |
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| CN108487949A CN108487949A (en) | 2018-09-04 |
| CN108487949B true CN108487949B (en) | 2020-08-18 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111005937B (en) | 2018-10-04 | 2021-11-19 | 三菱重工业株式会社 | Squeeze film damper and rotary machine |
| CN109139794B (en) * | 2018-10-23 | 2024-04-09 | 珠海格力智能装备有限公司 | Damper and overspeed testing machine with same |
| CN109764088B (en) * | 2019-01-09 | 2019-11-08 | 东南大学 | A kind of squeeze film thickness adjusting apparatus |
| CN110510156B (en) * | 2019-09-03 | 2023-03-31 | 哈尔滨工业大学 | Expansion type momentum wheel body assembly |
| CN110578753A (en) * | 2019-09-22 | 2019-12-17 | 中国航发沈阳发动机研究所 | Bearing vibration damping structure |
| CN110886812A (en) * | 2019-11-26 | 2020-03-17 | 北京化工大学 | Symmetrical continuous integral squeeze film damper |
| CN114151451A (en) * | 2021-11-22 | 2022-03-08 | 中南大学 | Gear vibration reduction structure and gear vibration reduction test equipment |
| CN114877003B (en) * | 2022-04-02 | 2023-06-20 | 哈尔滨工业大学 | Novel extrusion oil film damper with self-adaptive check valve in oil supply hole |
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| JPS4873635A (en) * | 1971-12-30 | 1973-10-04 | ||
| DE4235569A1 (en) * | 1992-10-22 | 1994-04-28 | Schaeffler Waelzlager Kg | Linear guide for guide of machine tool - has squeeze hydraulic film between surfaces as oscillation damper |
| DE102010048381A1 (en) * | 2010-10-13 | 2012-04-19 | Schaeffler Technologies Gmbh & Co. Kg | Floating bearing with damping function |
| CN106989917A (en) * | 2017-06-01 | 2017-07-28 | 中国航发湖南动力机械研究所 | Flexibly support the dynamic stiffness measurement device and its measuring method of squeeze film damper |
| CN107435564A (en) * | 2016-05-05 | 2017-12-05 | 通用电气公司 | The system and method for bearing damp device with external support spring |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10731510B2 (en) * | 2014-05-16 | 2020-08-04 | Raython Technologies Group | Gas turbine engine with fluid damper |
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2018
- 2018-06-28 CN CN201810689142.1A patent/CN108487949B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4873635A (en) * | 1971-12-30 | 1973-10-04 | ||
| DE4235569A1 (en) * | 1992-10-22 | 1994-04-28 | Schaeffler Waelzlager Kg | Linear guide for guide of machine tool - has squeeze hydraulic film between surfaces as oscillation damper |
| DE102010048381A1 (en) * | 2010-10-13 | 2012-04-19 | Schaeffler Technologies Gmbh & Co. Kg | Floating bearing with damping function |
| CN107435564A (en) * | 2016-05-05 | 2017-12-05 | 通用电气公司 | The system and method for bearing damp device with external support spring |
| CN106989917A (en) * | 2017-06-01 | 2017-07-28 | 中国航发湖南动力机械研究所 | Flexibly support the dynamic stiffness measurement device and its measuring method of squeeze film damper |
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